Android Camera2 实现连拍

gitee 链接：
通过 captureBurst 实现连拍
拍完的图片放在 /data/data/com.example.burstcapture/files/

连拍的具体实现代码在 BurstCapture.java 、BurstCaptureExpo.java、BurstCaptureFocus.java中，调用在 MainActivity.java中，调用方式很简单

普通连拍直接创建 BurstCapture 这个类，在这个类的构造方法中会发 request

注意：下面代码中的照片保存的路径 /data/data/com.example.burstcapture/files/ 中的 files 文件夹是我自己创建的，你需要自己手动创建下。

下面代码即可实现连拍：

mImageReader.setOnImageAvailableListener(mReaderImgListener, null);
mStillBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
mStillBuilder.addTarget(mImageSurface);
CaptureRequest request = mStillBuilder.build();
List<CaptureRequest> requests = new ArrayList<>();
// 改变下面的i的取值范围就可以改变连拍的数量
for(int i=0;i<3;i++)requests.add(request);
mCaptureSession.captureBurst(requests, null, null);

ImageReader.OnImageAvailableListener mReaderImgListener = new ImageReader.OnImageAvailableListener() {@Overridepublic void onImageAvailable(ImageReader reader) {writeImageToFile();}
};
private void writeImageToFile() {String filePath = "/data/data/com.example.burstcapture/files/"+imageIndex+".jpg";imageIndex++;Image image = mImageReader.acquireNextImage();if (image == null) {return;}ByteBuffer byteBuffer = image.getPlanes()[0].getBuffer();byte[] data = new byte[byteBuffer.remaining()];byteBuffer.get(data);FileOutputStream fos = null;try {fos = new FileOutputStream(new File(filePath));fos.write(data);} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {try {fos.close();fos = null;} catch (IOException e) {e.printStackTrace();} finally {image.close();image = null;}}
}

不同曝光时间的连拍：

mStillBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
mStillBuilder.set(CaptureRequest.CONTROL_CAPTURE_INTENT, CaptureRequest.CONTROL_CAPTURE_INTENT_STILL_CAPTURE);
// 把AE关掉，通过手动的方式控制AE
mStillBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_OFF);

private void takePicturePrecapture(){final CaptureRequest.Builder precaptureBuilder;try {precaptureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);precaptureBuilder.set(CaptureRequest.CONTROL_CAPTURE_INTENT, CaptureRequest.CONTROL_CAPTURE_INTENT_STILL_CAPTURE);precaptureBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_IDLE);precaptureBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER, CameraMetadata.CONTROL_AE_PRECAPTURE_TRIGGER_IDLE);precaptureBuilder.addTarget(mPreViewSurface);int sequenceId = mCaptureSession.capture(precaptureBuilder.build(), null, null);sequenceId = mCaptureSession.setRepeatingRequest(precaptureBuilder.build(), null, null);precaptureBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER, CameraMetadata.CONTROL_AE_PRECAPTURE_TRIGGER_START);sequenceId = mCaptureSession.capture(precaptureBuilder.build(), mMCaptureCallback, null);} catch (CameraAccessException e) {e.printStackTrace();}
}

MCaptureCallback mMCaptureCallback = new MCaptureCallback();private class  MCaptureCallback extends CameraCaptureSession.CaptureCallback {@Overridepublic void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {Log.e("TAG", "============================== onCaptureCompleted: ");Integer ae_state = result.get(CaptureResult.CONTROL_AE_STATE);if (ae_state == CaptureResult.CONTROL_AE_STATE_PRECAPTURE){try {mStillBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);mStillBuilder.set(CaptureRequest.CONTROL_CAPTURE_INTENT, CaptureRequest.CONTROL_CAPTURE_INTENT_STILL_CAPTURE);// 把AE关掉，通过手动的方式控制AEmStillBuilder.set(CaptureRequest.CONTROL_AE_MODE, CameraMetadata.CONTROL_AE_MODE_OFF);mStillBuilder.set(CaptureRequest.FLASH_MODE, CameraMetadata.FLASH_MODE_TORCH); // just in casemStillBuilder.addTarget(mImageSurface);CaptureRequest captureRequest = mStillBuilder.build();List<CaptureRequest> requests = new ArrayList<>();Range<Integer> iso_range = mCharacteristics.get(CameraCharacteristics.SENSOR_INFO_SENSITIVITY_RANGE); // may be null on some devicesint iso = 800;// see https://sourceforge.net/p/opencamera/tickets/321/ - some devices may have auto ISO that's// outside of the allowed manual iso range!iso = Math.max(iso, iso_range.getLower());iso = Math.min(iso, iso_range.getUpper());mStillBuilder.set(CaptureRequest.SENSOR_SENSITIVITY, iso );mStillBuilder.set(CaptureRequest.SENSOR_FRAME_DURATION, 1000000000L/30);int n_half_images = 3/2;long base_exposure_time = 22222000;long min_exposure_time = base_exposure_time;long max_exposure_time = base_exposure_time;float expo_bracketing_stops = 2.0f;final double scale = Math.pow(2.0, expo_bracketing_stops/(double)n_half_images);Range<Long> exposure_time_range = mCharacteristics.get(CameraCharacteristics.SENSOR_INFO_EXPOSURE_TIME_RANGE); // may be null on some devicesif( exposure_time_range != null ) {min_exposure_time = exposure_time_range.getLower();max_exposure_time = exposure_time_range.getUpper();}// darker imagesfor(int i=0;i<1;i++) {long exposure_time = base_exposure_time;if( exposure_time_range != null ) {double this_scale = scale;for(int j=i;j<n_half_images-1;j++)this_scale *= scale;exposure_time /= this_scale;if( exposure_time < min_exposure_time )exposure_time = min_exposure_time;mStillBuilder.setTag(new String("darker images"));mStillBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, exposure_time);Log.e("TAG", " 0000000000 ");requests.add( mStillBuilder.build() );}}Log.e("666666", "scale = "+scale +" base_exposure_time = "+base_exposure_time+" exposure_time = "+base_exposure_time/scale);mStillBuilder.setTag(new String("base image"));// base imagemStillBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, base_exposure_time);requests.add( mStillBuilder.build() );// lighter imagesfor(int i=0;i<n_half_images;i++) {long exposure_time = base_exposure_time;if( exposure_time_range != null ) {double this_scale = scale;for(int j=0;j<i;j++)this_scale *= scale;exposure_time *= this_scale;if( exposure_time > max_exposure_time )exposure_time = max_exposure_time;mStillBuilder.setTag(new String("lighter images"));mStillBuilder.set(CaptureRequest.SENSOR_EXPOSURE_TIME, exposure_time);Log.e("TAG", " 1111111111111 ");requests.add( mStillBuilder.build() );}}Log.e("TAG", "n_half_images = "+n_half_images );Log.e("666666", "scale = "+scale +" exposure_time = "+(scale * base_exposure_time)+" base_exposure_time = "+base_exposure_time);//            mCaptureSession.stopRepeating();mCaptureSession.captureBurst(requests, null, null);} catch (CameraAccessException e) {e.printStackTrace();}}super.onCaptureCompleted(session, request, result);}}

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